Steel manufacturers supplying the European Union need to account for emissions embedded in upstream materials, including electricity-related emissions associated with certain iron ore precursors. Although most covered steel products are subject to direct-emissions treatment under the Carbon Border Adjustment Mechanism (CBAM), the treatment of precursor materials can introduce additional emissions components into downstream calculations.
This distinction affects export pricing, supplier selection and investment decisions. Manufacturers that concentrate exclusively on electricity consumption at their finishing facilities may overlook emissions data required from the installations producing their steel inputs.
Sintered iron ore brings indirect emissions into the calculation
Sintered or agglomerated iron ore classified under CN code 2601 12 00 is a key example of a precursor for which indirect emissions are included. Those emissions can be carried into the embedded emissions of downstream steel products manufactured using the material.
Consequently, the direct-emissions treatment applicable to a final steel product does not mean that electricity-related emissions can be excluded throughout its entire production chain. The relevant precursor must be assessed according to its own CBAM treatment and the applicable rules for calculating emissions in downstream goods.
For integrated steel producers, this creates a measurement challenge involving process boundaries and electricity allocation. Consumption associated with ore agglomeration must be identified within the overall electricity balance of the installation, while electricity used in other steelmaking operations must be treated according to the rules applicable to those processes.
A facility with a shared electricity distribution system may rely on a single utility meter covering sintering, steelmaking and ancillary equipment. In such cases, a defensible allocation methodology supported by process-level measurements is needed to establish which electricity consumption belongs to the precursor whose indirect emissions are included.
Without an adequate distinction between processes, manufacturers may find it difficult to demonstrate how much electricity consumption should be attributed to the relevant precursor and how its emissions affect the downstream product.
Purchased steel inputs can determine downstream emissions exposure
The issue also affects processors that purchase steel rather than produce it from upstream materials. A rolling mill may maintain detailed electricity records and operate efficient equipment but still lack sufficient evidence concerning the emissions embedded in the steel it receives.
Improving the mill’s own electricity procurement does not resolve uncertainty surrounding the upstream production of its purchased inputs. Where precursor emissions materially affect the downstream calculation, the quality of supplier information can become a more significant consideration than marginal improvements in electricity consumption at the finishing facility.
An illustrative manufacturer purchasing 50,000 tonnes of a covered steel precursor would face a difference of 10,000 tonnes of CO₂ in the usable embedded-emissions information if the reported values differed by 0.20 tonnes of CO₂ per tonne of material.
At an assumed carbon price of €80 per tonne of CO₂, the resulting unadjusted exposure sensitivity would be €800,000, before applicable adjustments and attribution to the exported goods.
This example does not establish a standard emissions difference between suppliers. The actual outcome depends on the precursor involved, the production route, the eligibility of the emissions data and the quantities incorporated into the final goods. It demonstrates how procurement decisions and the reliability of upstream information can affect the assessment of CBAM exposure.
Supplier documentation must connect emissions to material flows
Purchasing departments should seek information identifying the producing installation and the relevant reporting period, rather than relying solely on generic averages supplied by trading companies covering multiple sources. Where actual precursor values are used, the evidence-gathering process must allow sufficient time for the required verification.
Material accounting must also establish how purchased precursors move through production. Opening inventories, incoming deliveries, internal transfers and closing stocks should support the quantities attributed to consumption of each material.
Where inputs from different sources are combined, the calculation must follow the applicable averaging and attribution rules. Commercial preferences cannot independently determine which emissions values are reported or how those values are allocated to production.
An internal reconciliation should compare the material ledger, production records and emissions calculations. Differences in reported tonnage may result from yield losses, inventory movements or reporting cut-off dates. These discrepancies need to be explained before the final information is provided to EU customers.
Electricity contracts must reflect the relevant production process
Renewable electricity procurement remains relevant when it supplies a process whose indirect emissions enter the applicable CBAM calculation. However, manufacturers should establish the precise scope of a proposed power purchase agreement (PPA) before projecting emissions or financial savings across their entire steel output.
A procurement arrangement that reduces electricity-related emissions associated with sintering does not establish that the same treatment applies to every downstream steelmaking operation. The expected benefit depends on the process supplied, the applicable emissions coverage and the supporting evidence.
Contracts with EU customers should distinguish between provisional carbon estimates used in commercial pricing and final verified emissions information. Provisions allowing estimates to be updated can help manage disputes when upstream documentation becomes available or the actual mix of production inputs changes.
This distinction is particularly relevant where selling prices incorporate assumptions about embedded emissions or potential CBAM costs. The commercial estimate and the final emissions calculation must remain aligned with the material quantities and evidence used for the exported goods.
Upstream data availability becomes a financing consideration
For lenders, dependence on a limited number of upstream suppliers creates a carbon-data risk alongside the conventional risk of supply disruption. A factory relying on a single producing installation may encounter difficulties if that supplier cannot provide usable emissions information.
Alternative sourcing therefore requires assessment of technical specifications, material costs and emissions-data quality together. A replacement supplier may meet the required production specifications, but its ability to provide suitable documentation remains a separate consideration in evaluating the exporter’s CBAM exposure.
For steel exporters, mapping the precursor chain is an important step before financing investments in cleaner finishing electricity on the assumption that these investments will resolve the principal regulatory risk. In cases where upstream precursor emissions enter the calculation, documentation from the installation producing the steel input may be more important to the CBAM assessment than records from the electricity supplier serving the downstream factory.
